/* 
 * Copyright (c) 2009, Giora Kosoi giorak@gmail.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Giora Kosoi ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL Giora Kosoi BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sparrow/udp_sender.h>
#include <sparrow/reactor.h>
#include <sparrow/errors.h>

UdpSender::UdpSender(Reactor *r, const std::string &config)
    :   Handler(r)
{
    register_input(0, this, &UdpSender::input);
}

void UdpSender::input(VariantSet *v)
{
    send_reply(v);
}

void UdpSender::send_reply(VariantSet *v)
{
    int server_fd = v->get("server-fd")->int32();
    const Variant *ip = v->get("peer-address");
    uint16_t port = (uint16_t)v->get("peer-port")->uint32();
    const Octets &message = v->get("udp-message-out")->octets();

    struct sockaddr_in dest_address;
    dest_address.sin_family = AF_INET;
    dest_address.sin_port = htons(port);
    memcpy(&dest_address.sin_addr, &ip->ipv4(), sizeof(dest_address.sin_addr));
    socklen_t dest_len = sizeof(dest_address);

    ssize_t result = sendto(
            server_fd, 
            &message.at(0), 
            message.size(), 
            0, 
            (const struct sockaddr *)&dest_address,
            dest_len);
    if(result == message.size())
    {
        delete v;
    }
    else if(result == -1)
    {
        if(errno == EAGAIN ||
           errno == EWOULDBLOCK ||
           errno == EINTR)
        {
            // continue trying until end of time or crash
            uint64_t token = v->get("udp-message-id")->uint64();
            get_reactor()->register_output_handler(server_fd, this, token);
            UnsentMessages::const_iterator i = unsent_messages_.find(token);
            if(i == unsent_messages_.end())
            {
                unsent_messages_[token] = v;
            }
        }
        else
        {
            throw_error<std::runtime_error>(__FILE__, __LINE__,
                    "failed sendto: %s:%d, error: [%s]", 
                    ip->str().c_str(),
                    port,
                    strerror(errno));
        }
    }
    else
    {
        throw_error<std::runtime_error>(__FILE__, __LINE__,
                    "unexpected result from sendto: %s:%d, result: [%d], error: [%s]", 
                    ip->str().c_str(),
                    port,
                    result,
                    strerror(errno));
    }
}

void UdpSender::handle_input(int fd, uint64_t token)
{
}

void UdpSender::handle_output(int fd, uint64_t token)
{
    UnsentMessages::const_iterator i = unsent_messages_.find(token);
    if(i != unsent_messages_.end())
    {
        send_reply(i->second);
    }
    else
    {
        throw_error<std::runtime_error>(__FILE__, __LINE__,
                "no message to send for id %lld", token);
    }
}

void UdpSender::handle_error(int fd, uint64_t token)
{
}

void UdpSender::handle_timeout(uint64_t token)
{
}

